/**
 * Created by Administrator on 2015/12/31.
 */
public class SyncObject {
    public static void main(String[] args) {
        final DualSynch ds = new DualSynch();
        new Thread(){
            @Override
            public void run() {
                ds.f();
            }
        }.start();
        ds.g();
    }
}

class DualSynch{
    private Object syncObject = new Object();

    public synchronized void f() {
        for (int i = 0; i < 5; i++) {
            System.out.println("f()");
            Thread.yield();
        }
    }

    public void g() {
        synchronized(syncObject){
            for (int i = 0; i < 5; i++) {
                System.out.println("g()");
                Thread.yield();
            }
        }

    }
}